The club have studied video evidence and disagree with the decision made by a referee in his first Championship game.
Even if the keeper on loan from Birmingham City is not available for Saturday's trip to Watford, City have applied to the Football League to have Scott Shearer recalled from his loan at Rushden.
The club does have two other keepers in Covsupport sponsored Jonny Tuffey and Cameron Belford, however, neither currently have a squad number.